Masdar City is a planned zero-carbon, zero-waste city in Abu Dhabi, UAE that will rely entirely on renewable energy. The city is being developed to minimize energy and water usage through sustainable design principles including solar orientation, efficient buildings, district cooling and heating, and water recycling. Transportation within Masdar City will utilize electric vehicles and personal rapid transit systems to reduce emissions. Once completed, Masdar City aims to house 50,000 residents and 1,500 cleantech companies in a self-sufficient, car-free urban environment powered solely by renewable energy.